Using @Embedded in @Embeddable class

Question

Can I use @Embedded in @Embeddable class in hibernate.

Example : A is an element collection in a diffirent class.

@Embeddable
class A {
 @Embedded
 B b;
}
@Embeddable
class B {
 @Embedded
 C c;
}
@Embeddable
class C {
 @Embedded
 D D;
}
@Embeddable
class D {
}

Is something of this kind valid in hibernate ? The third level of nesting.

Answer 1

Yes, it is valid in Hibernate to nest @Embedded objects.

Directly from the documentation :

Embeddable types can be nested. That is, an @Embeddable class may have an attribute whose type is itself a different @Embeddable class.

For example, from the specification :

@Embeddable public class Address {
 protected String street;
 protected String city;
 protected String state;
 @Embedded protected Zipcode zipcode;
}
@Embeddable public class Zipcode {
 protected String zip;
 protected String plusFour;
}

• Sandeep Rao: I'm able to get upto the second level of nesting is third level of nesting valid. My issue is i'm unable to rename the thrid level parameters with attributeoveride of columns. Thanks for replying !
• John Ericksen: Hmm, are your column names duplicated?
• Sandeep Rao: No, They are different in class D

Answer 2

As mentioned by johncarl, it is possible. In order to rename nested attributes you have to specify the entire chain, using '.' as separator. For example, if class D has an attribute foo, then in class A you would need to rename it as such:

@Embedded
@AttributeOverride(name = "c.D.foo", column = @Column(name = "bar"))
B b;